II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
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R. Gross, A. Marx, and F. Deppe © Wal<strong>the</strong>r-Meißner-Institut (2001 - 2013)<br />
4.4.2 Gradiometers<br />
AS-Chap. 4 - 53<br />
for biomagnetic measurements:<br />
reduce perturbing environmental magnetic fields<br />
- non-magnetic materials<br />
- ¹-metal shields<br />
- magnetically shielded rooms<br />
and/or: n th -order gradiometers suppression <strong>of</strong> remote signals<br />
PTB Berlin:<br />
7 ¹-metal shields<br />
1 Al layer<br />
active field reduction<br />
shielding factor:<br />
2£ 10 6 @ 0.01 Hz<br />
2£ 10 8 @ 5 Hz
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